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Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation (CROSBI ID 203525)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Njegić Džakula, Branka ; Kontrec, Jasminka ; Ukrainczyk, Marko ; Sviben, Sanja ; Kralj, Damir Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation // Crystal research and technology, 49 (2014), 4; 244-256. doi: 10.1002/crat.201300388

Podaci o odgovornosti

Njegić Džakula, Branka ; Kontrec, Jasminka ; Ukrainczyk, Marko ; Sviben, Sanja ; Kralj, Damir

engleski

Polymorphic composition and morphology of calcium carbonate as a function of ultrasonic irradiation

This paper reports on the precipitation of CaCO3 polymorphs, having various crystal morphologies under different conditions. In particular, systems that were subject to ultrasonic irradiation were compared to the corresponding reference systems in the absence of such a treatment. The application of ultrasonic irradiation predominantly resulted in a change of particle size distribution and polymorphic composition of the precipitate, in comparison to the reference systems. Thus, it was found that the supersaturation and temperature influenced the size distribution, in both the reference and sonicated systems. A mixture of calcite, vaterite and aragonite was obtained in all reference systems, at 25 °C. At this temperature, the sonication caused the vaterite content to increase, while aragonite was not detected. In reference and sonicated systems at 80 °C, only aragonite precipitated. The results also indicate that the principle parameter responsible for the morphology of vaterite was the initial supersaturation: at higher supersaturation spherical vaterite particles precipitated, while at lower supersaturation hexagonal platelets were obtained. The morphological investigations also indicated different mechanisms of vaterite formation in the systems in which precipitation was initiated at higher supersaturation: spherulitic growth of vaterite was observed in sonicated systems, while the aggregation of primary particles was predominant in the reference systems. At lower supersaturation, the effect of c(Ca2+)/c(CO32-) on the morphology of hexagonal platelets of vaterite was observed as well. By varying the c(Ca2+)/c(CO32-), significant changes of the polymorphic composition were observed only in the sonicated systems, at 25 ˚C.

calcium carbonate; vaterite; ultrasonic irradiation; morphology; polymorphism

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Podaci o izdanju

49 (4)

2014.

244-256

objavljeno

0232-1300

10.1002/crat.201300388

Povezanost rada

Kemija

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